Why Does Concrete Settle?
There are many reasons why concrete settles, such as poor drainage, bad site conditions, and low-quality compaction. The most common reason we see is when rainwater washes away dirt from under the driveway or sideway, creating pockets beneath the concrete. This causes the concrete to settle.
Another reason is clay-rich soil. This soil expands and contracts based on the level of moisture in it. When the soil is saturated with water, it expands. Then, the soil shrinks when it dries. This instability in soil makes the concrete move and sink gradually.